Results of the Project Mercury Ballistic and Orbital Chimpanzee Flights

NASA SP-39, the full official account of the Mercury chimpanzee program: planning, training, in-flight measurements, and postflight evaluation for the suborbital ballistic flight of “Ham” (MR-2, January 31 1961), the prelude to Alan Shepard’s suborbital flight, and the orbital flight of “Enos” (MA-5, November 29 1961), which preceded John Glenn’s orbital flight. Prepared by the Manned Spacecraft Center, Houston; Office of Scientific and Technical Information, NASA, Washington, D.C., 1963. Illustrated in detail throughout, including photographic plates of the flight chimpanzees in their restraint garment (“spacesuit”) before flight and at recovery.